/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.connector;

import org.apache.catalina.security.SecurityUtil;

import javax.servlet.ServletInputStream;
import java.io.IOException;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;

/**
 * This class handles reading bytes.
 *
 * @author Remy Maucherat
 * @author Jean-Francois Arcand
 */
public class CoyoteInputStream
		extends ServletInputStream {


	// ----------------------------------------------------- Instance Variables

	protected InputBuffer ib;


	// ----------------------------------------------------------- Constructors

	protected CoyoteInputStream(InputBuffer ib) {
		this.ib = ib;
	}


	// -------------------------------------------------------- Package Methods

	/**
	 * Clear facade.
	 */
	void clear() {
		ib = null;
	}


	// --------------------------------------------------------- Public Methods

	/**
	 * Prevent cloning the facade.
	 */
	@Override
	protected Object clone()
			throws CloneNotSupportedException {
		throw new CloneNotSupportedException();
	}


	// --------------------------------------------- ServletInputStream Methods

	@Override
	public int read()
			throws IOException {
		if (SecurityUtil.isPackageProtectionEnabled()) {

			try {
				Integer result =
						AccessController.doPrivileged(
								new PrivilegedExceptionAction<Integer>() {

									@Override
									public Integer run() throws IOException {
										Integer integer = Integer.valueOf(ib.readByte());
										return integer;
									}

								});
				return result.intValue();
			} catch (PrivilegedActionException pae) {
				Exception e = pae.getException();
				if (e instanceof IOException) {
					throw (IOException) e;
				} else {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		} else {
			return ib.readByte();
		}
	}

	@Override
	public int available() throws IOException {

		if (SecurityUtil.isPackageProtectionEnabled()) {
			try {
				Integer result =
						AccessController.doPrivileged(
								new PrivilegedExceptionAction<Integer>() {

									@Override
									public Integer run() throws IOException {
										Integer integer = Integer.valueOf(ib.available());
										return integer;
									}

								});
				return result.intValue();
			} catch (PrivilegedActionException pae) {
				Exception e = pae.getException();
				if (e instanceof IOException) {
					throw (IOException) e;
				} else {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		} else {
			return ib.available();
		}
	}

	@Override
	public int read(final byte[] b) throws IOException {

		if (SecurityUtil.isPackageProtectionEnabled()) {
			try {
				Integer result =
						AccessController.doPrivileged(
								new PrivilegedExceptionAction<Integer>() {

									@Override
									public Integer run() throws IOException {
										Integer integer =
												Integer.valueOf(ib.read(b, 0, b.length));
										return integer;
									}

								});
				return result.intValue();
			} catch (PrivilegedActionException pae) {
				Exception e = pae.getException();
				if (e instanceof IOException) {
					throw (IOException) e;
				} else {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		} else {
			return ib.read(b, 0, b.length);
		}
	}

	@Override
	public int read(final byte[] b, final int off, final int len)
			throws IOException {

		if (SecurityUtil.isPackageProtectionEnabled()) {
			try {
				Integer result =
						AccessController.doPrivileged(
								new PrivilegedExceptionAction<Integer>() {

									@Override
									public Integer run() throws IOException {
										Integer integer =
												Integer.valueOf(ib.read(b, off, len));
										return integer;
									}

								});
				return result.intValue();
			} catch (PrivilegedActionException pae) {
				Exception e = pae.getException();
				if (e instanceof IOException) {
					throw (IOException) e;
				} else {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		} else {
			return ib.read(b, off, len);
		}
	}

	@Override
	public int readLine(byte[] b, int off, int len) throws IOException {
		return super.readLine(b, off, len);
	}

	/**
	 * Close the stream
	 * Since we re-cycle, we can't allow the call to super.close()
	 * which would permanently disable us.
	 */
	@Override
	public void close() throws IOException {

		if (SecurityUtil.isPackageProtectionEnabled()) {
			try {
				AccessController.doPrivileged(
						new PrivilegedExceptionAction<Void>() {

							@Override
							public Void run() throws IOException {
								ib.close();
								return null;
							}

						});
			} catch (PrivilegedActionException pae) {
				Exception e = pae.getException();
				if (e instanceof IOException) {
					throw (IOException) e;
				} else {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		} else {
			ib.close();
		}
	}

}
